New Jun-12-2007 beta available now.

 From:  Schbeurd
670.18 In reply to 670.17 
>> The quad meshing improvement also helps with symmetry - this enables an n-gon that looks exactly like a single column of quads to be split into quads instead of triangulated (in quads & triangles export mode). This also improves symmetry for that shape you previously posted.

Cool ! I think I'm gonna enjoy using MoI objects inside Modo and ZBrush... ;-) I'll try to find some time to make tests during the next week-end.
The news in another thread about vertex smoothing support in Modo 301 is interesting too... Things are going in the good direction, hehe...